Furnace for steam-boilers



(No Model) E. M. B'OSLEY. FURNACE FOR STEAM BOILERS.

Patented May 30 UNITED STATES PATENT OFFICE.

ELIJAH M. BOSLEY, OF ST. LOUIS, MISSOURI.

FURNACE FOR STEAM-BOILERS.

SPECIFICATION forming part Of Letters Patent N0. 498,378, dated May 30, 1893.

Application filed February 20, 1893. Serial No. 463,134.- (No model.)

To aZZ whom it may concern;

Be it known that I, ELIJAH M. BosLEY, of the city of St. Louis, State of Missouri, have invented a new and useful Improvement in Furnaces for Steam-Boilers, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings.

The object of my invention is to cause a more perfect combustion of bituminous coal, and preventing smoke without exposing the shell of boiler to drafts of cold air above fire by the combination of ordinary surface burning grates with short water tube down draft grates.

Figure l of the drawings represents a horizontal section of my improved furnace, taken on line :1: 0c of Fig. 2; Fig. 2 a vertical longitudinal section thereof; Fig. 3 a transverse section taken on line y y of Fig. 2; Fig. 4 a transverse section taken on line 2 z.

In the accompanying drawings A repre sents the ordinary grate-bars and B are the tubes forming what is known as Water gratebars, which bars are located back of and above the bars A and are divided from them by a central water chamber J connected at its top and ends to the main boiler by means of the pipes L, each pipe being provided with a valve G. The opposite end of the water bars are connected to the rear Water chamber I which depends from the boiler and forms a shield to turn the current downward through the water-grate. This water chamber is also connected at its top with the boiler by pipes M which pipes are provided with valves G and blow-off valves H are connected with the bottom of the chamber as shown. WVhen opening the valves G G a circulation with the main boiler through the water chambers and water grate is maintained, and by closing either sets of valves G or G and opening the valves H or H the sediment collecting in the bottom of the water chambers I or J may be blown out. Below the grate bars A is formed an ash-pit E by means of the partition E, said pit having an opening 0 for supplying air to the fire on these bars. Below the ash-pit E is the ash-pit F for the bars B,

which pit is provided with doors K for regulating the quantity of air to the combustion chamber 1).

The operation is as follows: Fresh fuel is fed upon the bars A in the front furnace which soon become incandescent and in such state the fuel is pushed upon the water-bars B, which bars are practically a second furnace. When another charge of fresh fuel is fed to the bars A, the gas escaping from this fuel passes through the incandescent fuel or grate B and mingling with the air beneath the grate producesacompletecombustion. Theintense heat immediately on or near the barsB causes a rapid circulation of water, thereby rapidly generating steam and protecting the grate.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a boiler furnace, the combination of the front grate and its independent ash-pit,

with the water-grate back of and above the front grate and connected so that water may circulate through it to the boiler, and the ashpit for the Water grate extending under the front ash-pit, substantially as and for the purpose set forth.

2. In a boiler furnace, the combination of the water-grate, and its independent ash-pit, with the water-grate back of and above the front grate, and the ash-pit for the watergrate extending under the front ash-pit and provided with doors for regulating the admission of air to the combustion chamber, substantially as and for the purpose specified.

3. In a boiler furnace, the combination of the front grate with the water-grate, the front and back water chambers, pipes connecting the water chambers to the boiler, and the two independent ash pits for the grates, substantially as and for the purpose set forth.

The above specification of my invention signed by me this 18th day of February, A. D. 1893.

ELIJAH M. BOSLEY.

I Witnesses:

A. H. KIROHNER, JAMES Y. STAGER. 

